err.. Where is the source of assembly lib?

[cp25stack]

Hi
I had try to understand the working of toolchain.
When i explore the "pspsdk_1.0-beta2/src" folder,
i found many assembly (*.S) files that use macro "IMPORT_FUNC".
(defined in "pspimport.s".) but i cannot understand that where is the functions that it imported came from?

I guess that it import function from *.a library
(such as lippspdisplay.a) is it a assembly library,
and where is the source code of that library?

Does it come with [pspsdk_1.0-beta2] package or where can i download it?

:) ??

[tabularasa]

Well, i guess those imported functions come from sony or say: the firmware. I guess those are beeing reversed engineere'd.